Obsessive-compulsive disorder (OCD) is a psychiatric condition characterized by the presence of obsessions and compulsions. Its prevalence in the general population is around 2 to 3%. Genetic factors are probably involved in its etiology. Studies suggest there are different subtypes of OCD: OCD with a positive family history of OCD, sporadic OCD, and OCD related to tics. Twin studies show a high concordance rate for monozygotic twins. Some of the family studies observed a higher risk for OCD among relatives of OCD patients. Segregation analysis studies suggest the possible role of a major gene effect in the etiology of the disorder. By means of molecular studies, several investigators have been trying to find a gene involved in the etiology of OCD.
Obsessive-compulsive disorder (OCD); genetics; Tourette's syndrome; tics